Speaker
Description
Jets are multiscale objects that provide a direct connection between partons and hadrons, making jet substructure measurements a powerful probe of both perturbative and non-perturbative QCD dynamics. At STAR, a broad set of jet substructure observables, including SoftDrop-groomed observables and N-point Energy Correlators (ENCs), is used to investigate parton shower evolution and hadronization mechanisms. These observables maintain a close connection to the underlying partonic dynamics, enabling detailed comparisons with first-principles theoretical calculations. Furthermore, charge-sensitive observables, such as charge-weighted ENCs, provide additional sensitivity to the hadronization process.
In this talk, we present recent STAR measurements of SoftDrop observables and ENCs for different jet transverse momenta and jet radii in both $p$+$p$ and heavy-ion collisions (Au+Au, Zr+Zr, Ru+Ru). These measurements provide new insights into the structure of jets and their modification in the QCD medium created at RHIC.